The male 'Aura for prayer is that he must cover himself with clothes from umbilicus of his abdomen to his knees, and it is better that his both shoulders should be covered.

The Noble Qur'an 7:32

O Children of Adam! Take your adornment (by wearing your clean clothes), while praying and going round (the Tawâf of) the Ka'bah, and eat and drink but waste not by extravagance, certainly He (Allâh) likes not Al-Musrifûn (those who waste by extravagance).
Say (O Muhammad SAW): "Who has forbidden the adoration with clothes given by Allâh, which He has produced for his slaves, and At-Taiyibât [all kinds of Halâl (lawful) things] of food?" Say: "They are, in the life of this world, for those who believe, (and) exclusively for them (believers) on the Day of Resurrection (the disbelievers will not share them)." Thus We explain the Ayât (Islâmic laws) in detail for people who have knowledge.